Treadle for autopneumatic pianos.



. 1, 1 PATENTED JAN. 31, 1905. P. ENGELHARDT & A J. HOBART. TREADLE FOR AUTOPNEUMATIG PIANOS.

APPLIOATION FILED HOV. 18,1904.

- Wlzzasses MWW UNITED STATES FREDERICK ENGELHARDT AND ADAM J HOBART, OF ST. J OHNSVILLE, I

Patented January 31, 190 5.

PATENT OFFICE.

NEW YORK, ASSIGNORS TO ROTH & ENGELHARDT, OF ST. JOHNS- VILLE, NEW YORK, A FIRM.

TREADLE FOR AUTOPNEUMATIO PIANOS- SPECIFICATION forming part of Letters Patent No. 781,410, dated January 31, 1905.

Application filed November 18, 1904. Serial No. 238,250.

To all whom it may concern.-

Be it known that We, FREDERICK ENGEL- HARDT and ADAM J. HOBART, citizens of the United States,residing at St. J ohnsville,Montgomery county, State of New York, have invented new and useful Improvements in Treadles for Autopneumatic Pianos, of which the following is a specification.

This invention relates to an autopneumatic piano in which the treadle for actuating the bellows may be readily folded into or withdrawn from the piano-case.

In the accompanying drawings, Figure l is a side view, partly in section, of our improved treadle, showing it unfolded; Fig. 2, a similar view showing it folded; and Fig. 3, a horizontal section on line 3 3, Fig. l.

The letter a represents the case of an autopneurnatic piano provided with a front opening a, which may be closed by a door Z) is a base supported upon elastic feet 5 and having a pair of rearwardly extending hooks 0. These hooks are adapted to engage sockets d,sunk into the bottom rail (0 of case a.

A pair of treadles e are hinged to support I) at e and are each provided at the back with a plate 6 To this plate is pivoted at f the front end of a link f, the rear end of which is pivoted at f to acurved arm g. This arm is connected by screws g to the movable board it of bellows h, which are normally collapsed by a spring if. The bellows 7b are attached to a transverse rail 6, inclosed within case a. When the treadles are unfolded, as in Fig. 1, the usual foot movement will oscillate them on hinge e, so that the bellows are operated by links f and arms 9. To fold the treadles, the hooks c are raised out of sockets (Z, and the treadles, together with the base I) and hooks c, are swung up on pivot f'into the position shown by dotted lines, Fig. 2. The treadles are then pushed back to cause links f to swing on pivots f and fold the links, together with the treadles, base, and hooks, into case at until the treadles rest against rail 2 Finally the door a is closed to render the treadles unaccessible.

It will be seen that when the treadles are unfolded they are projected in front of the piano-case, so as to be exposed and readily accessible. When the treadles are folded,they are swung into the case to be fully concealed and protected.

What we claim is 1. In an autopneumatic piano, the combination of a movable base with a treadle hinged thereto, a hook and socket for locking the base to the piano-case, a link pivoted to the treadle, and bellows operatively connected to the link, substantially as specified.

2. In an autopneumatic piano, the combination of a movable base with a treadle hinged thereto, a hook and socket for locking the base to the piano-case, a link pivoted to the treadle, an arm pivoted to the link, and bellows connected to the arm, substantially as specified.

Signed by us at St. Johnsville, Montgomery county, New York, this th day of November, 1904.

FREDERICK ENGELHARDT. ADAM J. HOBART. Witnesses:

HENRY H. CARROLL, WALTER L. ENGELIIARDT. 

